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R. Belmans D. Verdyck W. Geysen Dep EE - Lab EMA K.U. Leuven |
Comparison of Starting Conditions of Induction Motors Fed from an Infinite Bus and Current Source Invertor using Finite Element CalculationsThe paper discusses the comparison between the locked rotor behaviour of a squirrel cage induction motor when fed with a qa variable stator frequency. The losses in the rotor are calculated for both infinite bus with sinusoidal voltage and block shape current from a Current Source Invertor (CSI). The behaviour is simulated using the finite element technique. For the simulation of the sinusoidal supply situation, a modified time harmonic solution is used. For the simulation of the CSI situation, a special method is developed accounting for saturation. The loses in the rotor by the induced currents are calculated from the vector potential solution. From the losses the torque is deduced. The torque results are experimentally verified. |
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